Carburetor



March 18, 1930. v. R. HEFTLER CARBURETOR Filed 00t- 26, 1922 NVENTOR@Ly/wi@ Patented Mar. 18, 1930 UNITED STATES PATENT OFFICE VICTOR R.HEFTLER, F DETROIT, MICHIGAN, ASSIGNOR T0 SOCIET DU CARBURATEU ZENITH,OF LYON, FRANCE, A. CORPORATION OF FRANCE Application led October 26,1922. Serial No. 597,032.

The` present invention relates to carburet-l ors of the type adapted foruse with internal combustion engines, and more particularly to improvedstructural featuresI whereby the manufacture and assembly of thecarburetor is facilitated and improved operating results areobtained.

In the accompanyin drawings there is shown, for purposes o illustratlononly, a preferred embodiment of this invention, it eing understood thatthe drawings do not define the limits of the invention as chan es mayobviously be made in the construction and operation disclosed without dearting from the spirit or scope of my roader claims'.

In these drawings,-

Figure 1 is a vertical sectional view,

through a carburetor constructed in accord- 20 ance with the presentinvention;

Figure 2 is a detail sectional view, on an enlarged scale, of a portionof the fuel feedinglmeans associated with the atmospheric we i Figure 3is a detail sectional view on an enlarged scale, illustrating animproved fuel feeding means; and

Figure 4 is a detail sectional view of a modiedform of fuel feedingmeans.

In carrying out the resent invention, there is preferably provided amain body member 2 in the form of a casting. This member may be, ifdesired, constructed of a corrodible metal, such as cast iron, where- Iby the cost of the construction is greatly reduced. Extending throughthe casting is the usual air inlet passage 3 which may be provided withan auxiliary air inlet control 4y of theA t e shown in m Patent` No.1,418,259, of ay 30, 1922, an with a choke valve 5.

Extending through thewall of the body member 2 is a set screw 6 adaptedto engage an opening in the casing 7 of a composite Venturi member. Thisventuri, while it ma be ofvanywell known construction, is pre /erably ofthe type illustrated in the copending application of Henri deBolschevalier, Serial No. 595,878, filed Oct. 20, 1922, which y resultedin Patent No. 567,043, patented Dec.

retor and also ,makes the filter readily acces- 29, 1925. This forms asuitable mixing chamber, the outlet from which may be controlled by athrottle valve 8, as is customary in the art.

Projecting laterally from one sideof the member 2 is a shelf 9 providedwith an opening adapted to receive a stem 10. This stem is preferablyformed with an upper shoulder 11 and is provided with an intermediatethreaded portion 12 adapted to coo erate with a nut 13. After the stemis sipped in plosition through the opening in the shelf 9 t ere isplaced over the lower end thereof a supplemental cover 14 having a deending iiange 15. This cover, after it is placed in position, is clampedagainst the lower .surface of the shelf by the nut 13.

The upper Vend of the stem 10 may be internally threaded to receive ascrew 16, by means of-which the gasoline inlet 17 may be adjustablyclamped in position. Surrounding the upper end of the stem 10 andenclosed within uthe casing formed bythe gasoline inlet, is a filter 18adapted to remove any foreign'particles from the fuel before its passageinto the longitudinally extending opening 19 in the stem. Thisconstruction permits the gasoline inlet to be readily ad- )usted asrequired in installing the carbu- 80 sible for cleaning and ins ection.

Intermediate its lengt and at substantially the point of intersection ofthe median horizontal and vertical planes extendingthrough the floatchamber, is a seat 20 for a needle valve 21 longitudinally movable inthe lower end ofthe stem. This needle valve is adapted to -be directlyoperated bg' a float 22 surrounding the stem and provi d with a'centralcup shaped member 23, the bottom of which engages the lower end of theneedle valve. By reason of this construction, it will be apparent thatas the ioat rises. it will directly operate the needle valve to cut offthe supply of gasoline, while as it lowers the re verse operation willtake lace.

The main body of the oat chamber may comprise a suitable stampin 24adapted to be clamped in position on a ase member 25 bV means of ahollow screw 26. The base 100 member, as disclosed in my copendingapplication hereinbefore referred to, is prefera ly composed ofnon-corrodible metal, such as brass,whereby the action of thegasolinethereon and of the water contained in the gasoline supply doesnot tend to 'corrode or otherwise 'clog theA fuel openings. This basemember may be secured to the main ,body member 1n any desired mannerwhereby it may be easily removed, as will be apparent.' The floatchamber preferably has a c'over 27 carried by the stamping.24..and-adapted to be enclosed within the supplemental cover 14 whenthe parts are in assembled'position. 15.

The idea broadly of constructing a carburetorfof a main-body portionhaving a projecting shelf and a separable base portion,

pheric well 29 is located entirely within the' main body portion 2 ofthe' carburetor and is adapted to supply fuel to a quill 31 deliveringfuelv for slow speed and starting purposes through a nozzle 32. Theamount' of well to the 'cap nozzle 38. When the the atmospheric well hasbeen exhausted,l

fuel in proportion to the air may becontrolled by a needle valve 33,asclearly shown in Figure2. For facilitating assembly, the upper 4end ofthe quill 31.may have a driven lit with a sleeve 34, which sleeve may beheld in position by a bent clip 35. rI he atmospheric well may be opento the atmosphere through suitably arranged openings 36.

Formed in the base member 25 and extend- Aingfrom the atmospheric wellto a point adj `jacent the main nozzle 30, is a-channel 37 45 adapted tofeed. fuel from the atmos 'helaric' e 1n which occurs at a timecomparatively early in the operation of the carburetor, a mixture of airand gasoline I'will thereafter be supplied? to the `cap jet.

In'order tov obtain the advantagesof the flow through yan. opening in arelatlvely thin member, as disclosed,l for example, in my Patent No.1,255,165, of February 5, 1918, the

body portion of both the: atmospheric well..

and the main nozzle is formed adjacent the `lower end with an inwardlyo'projecting shoulder 39 and a peripheral flange 40. During themanufacture of the parts, disks 41 are laced against the shoulders 39and within t 'e peripheral flanges, and the flanges are then turnedinwardly to tightly clamp the disks in, position. 'With, thisconstruction vitis unnecessary to provlde a separate pe;

f removability.

cilitated. At the same time, this construction prevents leakage ofgasoline around the disks,

thereby necessitating a determinate flowv .through the calibratedopenings provided 1n.

th'e disks forthat purpose.

In some 'casesit has been disk has a tendency to buckle, therebychanging the flow characteristics-of the calibrated ripheral'envelopefor'enclosing the disks, and the assembly'of the carburetor is greatlyfafound that a flat orifice. -This may beeasily overcome by the modifiedconstruction illustrated in Figure 4. In this form, the calibratedopening 42 is `formed in the disk shaped portion ofta cupshaped blankv43. yBy knownJapparatus, such as a compound die, the cups may besimulvtaneously cut from a body of metal, drawn, and pierced. This cupmaythen be secured,

as by soldering, within'a suitable holder'43.

In this construction'thereis an inwardly projecting shoulder 44 and aperipheral liange 45, there being a fuel feeding passage 46 through thebody of the holder.

The advantages of the present invention arise from the improvedconstruction whereby it is possible to'locate the atmospheric wellentirely within the4 carbureting passage while maintaining all of theadvantages of Further advantages arise from the improved meansforholding4 the `disksin position within the fuel feeding devices.-Iclaimz' 1. In a carburetor, a main body having an air passage thereinforminga mixing chamber extending completely through the body 'in' onedirectlon, abasesecured to said body and having a fuel 'passage therein,said base closing the through extension of said passage, a float chamberexteriorly of the mixing chamber and communicating with said fuelpassage,- an atmospheric well` physically inside of the walls of themixing chamber and com municatin with said fuel passage, and

lmeans for dellvering'fuel from said well to said mixing'chamber,'-saidwell being bodily removable lfrom said base.

2. In a carburetor, a main body having an' air passage therein forming amixing cham ber extending com letely through the body 1n one dlrection,a ase secured to said body and', having a fuel' passage therein, said.base y closing the through extension of said passage,

a float chamber exteriorly ofl the mixing.V

chamber and communicatin with said fuel passage, an atmospheric welphysically inside of the walls of the mixin chamber and communicatinwith. said fue passage, and means dispose vlaterally of said well andcarried by said base for delivering fuel from said well to said mixingchamber, both said well and said means being bodily removable fromv 3.In a carburetor a main body having an 'air passage therein .forming amixmg/cham-/H/ Macnee ber extending completely through the body in onedirection, a base secured to said body and closing the through extensionof said passage, an atmospheric Well carried by said base and locatedphysically inside of the Walls of said mixing chamber, fuel feedingmeans Within said mixing chamber carried by said base and disposedlaterally of said Well, said means being operatively connected to saidWell, and a separate fuel supply for said means, said Well and saidmeans both being removable from said base.

4. In a carburetor, a main body having 'an air passage therein forming amixing chamber extending completely through the body in one direction, abase secured to said body and closing the through extension of saidpassage, an atmospheric Wall carried by said base and located physicallyinside of the Walls of said mixing chamber, fuel feeding means Withinsaid mixing chamber carried by said base and disposed laterally of saidWell, said means being operatively connected to said Well, and aseparate fuel supply for said means, said Well and said means' bothbeing removable from said base and said operative connection betweensaid Well and said means being freely accessible upon and by removal ofsaid Well and means.

5. In a carburetor, a main body having an air passage therein forming amixing chamber extending completely through the body in one direction, abase secured to said body and closing the through extension of said airpassage, a removable atmospheric Well carried b said base and locatedphysically inside o the Walls of said passage, a fuel feedl ing meansWithin said passage positioned laterally of said atmospheric Well, saidfuel feeding means being operatively connected to said Well, meansoperative for feeding a substantially constant supply of fuel per unitof time to said Well when free of accumulated fuel irrespective ofengine suction, and separate fuel feeding means cooperating with saidwell and discharging into said passage.

In testimony whereof I have hereunto set my hand.

VICTOR R. HEFTLER.

